Image display apparatus, mobile terminal and method for operating the same

ABSTRACT

An image display apparatus, a mobile terminal and a method for operating the same are discussed. The method for operating the image display apparatus includes entering a wireless audio transmission mode, performing synchronization with a mobile terminal using a first wireless communication method, extracting audio data from multimedia data, and transmitting the extracted audio data to the mobile terminal using a second wireless communication method different from the first wireless communication method. By this configuration, it is possible to improve user convenience.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority to and the benefit of Korean PatentApplication Nos. 10-2012-0061623 and 10-2012-0061625, filed on Jun. 8,2012 in the Korean Intellectual Property Office, the disclosure of whichis incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Embodiments of the invention relate to an image display apparatus, amobile terminal and a method for operating the same, and moreparticularly to an image display apparatus, a mobile terminal and amethod for operating the same, which are capable of improving userconvenience.

2. Description of the Related Art

An image display apparatus functions to display images to a user. A usercan view a broadcast program using an image display apparatus. The imagedisplay apparatus can display a broadcast program selected by the useron a display from among broadcast programs transmitted from broadcastingstations. The recent trend in broadcasting is a worldwide transitionfrom analog broadcasting to digital broadcasting.

Digital broadcasting transmits digital audio and video signals. Digitalbroadcasting offers many advantages over analog broadcasting, such asrobustness against noise, less data loss, ease of error correction, andthe ability to provide clear, high-definition images. Digitalbroadcasting also allows interactive viewer services, compared to analogbroadcasting.

SUMMARY OF THE INVENTION

Therefore, the invention has been made in view of the above problems,and it is an object of the invention to provide an image displayapparatus, a mobile terminal and a method for operating the same, whichare capable of improving user convenience.

It is another object of the invention to provide an image displayapparatus, a mobile terminal and a method for operating the same, whichare capable of conveniently transmitting and playing back audio databetween the image display apparatus and the mobile terminal in awireless manner.

In accordance with an aspect of the invention, the above and otherobjects can be accomplished by the provision of a method for operatingan image display apparatus including entering a wireless audiotransmission mode, performing synchronization with a mobile terminalusing a first wireless communication method, extracting audio data frommultimedia data, and transmitting the extracted audio data to the mobileterminal using a second wireless communication method different from thefirst wireless communication method.

In accordance with another aspect of the invention, there is provided amethod for operating a mobile terminal including performingsynchronization with an image display apparatus using a first wirelesscommunication method according to a wireless audio transmission mode,receiving audio data from the image display apparatus using a secondwireless communication method different from the first wirelesscommunication method, and playing back the received audio data.

In accordance with another aspect of the invention, there is provided animage display apparatus including a display, a network interfaceconfigured to exchange data with a mobile terminal, and a controllerconfigured to perform synchronization with the mobile terminal using afirst wireless communication method according to a wireless audiotransmission mode, to extract audio data from multimedia data, and totransmit the extracted audio data to the mobile terminal using a secondwireless communication method different from the first wirelesscommunication method.

In accordance with another aspect of the invention, there is provided amobile terminal including an audio output module configured to output anaudio signal to be played back, a wireless communication unit configuredto exchange data with an image display apparatus, and a controllerconfigured to perform synchronization with the image display apparatususing a first wireless communication method according to a wirelessaudio transmission mode and to play back audio data received from theimage display apparatus using a second wireless communication methoddifferent from the first wireless communication method.

In accordance with another aspect of the invention, there is provided amethod for operating an image display apparatus including receiving awireless audio transmission mode entrance signal from a mobile terminal,transmitting information about audio data to be transmitted to themobile terminal, receiving decoding information from the mobileterminal, transmitting audio data of an encoding state corresponding tothe decoding information, and playing back multimedia data associatedwith the audio data.

In accordance with another aspect of the invention, there is provided amethod for operating an image display apparatus including transmittingaudio data of multimedia data to a mobile terminal, playing back themultimedia data, receiving wireless channel environment informationbetween the mobile terminal and the image display apparatus or playbackdelay information of the mobile terminal during the multimedia dataplayback, and performing signal processing such that the multimedia dataplayback is synchronized with audio data playback of the mobile terminalbased on the wireless channel environment information or the playbackdelay information.

In accordance with another aspect of the invention, there is provided amethod for operating a mobile terminal including transmitting a wirelessaudio transmission mode entrance signal to an image display apparatus,receiving information about audio data to be transmitted from the imagedisplay apparatus, transmitting decoding information indicating whetheraudio data to be received can be decoded to the image display apparatusbased on information about the audio data, receiving audio data of anencoding state corresponding to the decoding information from the imagedisplay apparatus, and playing back the received audio data.

In accordance with another aspect of the invention, there is provided amethod for operating a mobile terminal including receiving audio datafrom an image display apparatus, calculating playback delay informationof the audio data, playing back the audio data, transmitting wirelesschannel environment information between the mobile terminal and theimage display apparatus or the playback delay information to the imagedisplay apparatus, receiving audio data corresponding to the wirelesschannel environment information or the playback delay information, andplaying back the audio data corresponding to the wireless channelenvironment information or the playback delay information.

In accordance with another aspect of the invention, there is provided animage display apparatus including a display, a network interfaceconfigured to exchange data with a mobile terminal, and a controllerconfigured to transmit information about audio data to be transmitted tothe mobile terminal if a wireless audio transmission mode entrancesignal is received from the mobile terminal, to transmit audio data ofan encoding state corresponding to decoding information if the decodinginformation is received from the mobile terminal, and to play backmultimedia data associated with the audio data.

In accordance with another aspect of the invention, there is provided amobile terminal including an audio output module configured to output anaudio signal to be played back, a wireless communication unit configuredto exchange data with an image display apparatus, and a controllerconfigured to transmit a wireless audio transmission mode entrancesignal to the image display apparatus, to transmit decoding informationindicating whether audio data to be received can be decoded to the imagedisplay apparatus based on information about audio data if theinformation about the audio data is received from the image displayapparatus, and to play back the received audio data if audio data of anencoding state corresponding to the decoding information is receivedfrom the image display apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of theinvention will be more clearly understood from the following detaileddescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a block diagram showing a configuration of an image displaysystem according to an embodiment of the invention;

FIG. 2 is a diagram showing an instance in which a user listens to anaudio signal using the image display system of FIG. 1;

FIG. 3 is a block diagram showing the internal configuration of an imagedisplay apparatus of FIG. 1;

FIG. 4 is a block diagram showing an example of a controller of FIG. 3;

FIG. 5 is a block diagram showing the internal configuration of awireless router of FIG. 1;

FIG. 6 is a block diagram showing the internal configuration of a mobileterminal of FIG. 1;

FIG. 7 is a flowchart illustrating a method for operating an imagedisplay apparatus according to an embodiment of the invention;

FIG. 8 is a flowchart illustrating a method for operating a mobileterminal according to an embodiment of the invention;

FIG. 9 is a flowchart illustrating an operation of an image displaysystem according to an embodiment of the invention;

FIGS. 10 to 14 are views referred to for describing various examples ofthe method for operating the image display apparatus of FIG. 7 or themethod for operating the mobile terminal of FIG. 8;

FIG. 15 is a flowchart illustrating a method for operating an imagedisplay apparatus according to another embodiment of the invention;

FIG. 16 is a flowchart illustrating a method for operating a mobileterminal according to another embodiment of the invention;

FIGS. 17 to 19 are views referred to for describing various examples ofthe method for operating the image display apparatus of FIG. 15 or themethod for operating the mobile terminal of FIG. 16;

FIG. 20 is a flowchart illustrating a method for operating an imagedisplay apparatus according to another embodiment of the invention;

FIG. 21 is a flowchart illustrating a method for operating a mobileterminal according to another embodiment of the invention; and

FIGS. 22A to 23D are views referred to for describing various examplesof the method for operating the image display apparatus of FIG. 20 orthe method for operating the mobile terminal of FIG. 21.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Example embodiments of the invention will be described with reference tothe attached drawings.

The terms “module” and “unit” attached to describe the names ofcomponents are used herein to help the understanding of the componentsand thus they should not be considered as having specific meanings orroles. Accordingly, the terms “module” and “unit” may be usedinterchangeably.

FIG. 1 is a diagram showing an image display system according to anembodiment of the invention.

Referring to FIG. 1, the image display system 10 according to theembodiment of the invention may include an image display apparatus 100,a mobile terminal 600 (e.g., mobile terminals 600 a and 600 b) and anetwork router 500.

The image display apparatus 100 may receive content. For example, theimage display apparatus may receive a broadcast signal via an antenna,receive an external input signal from an external device via aHigh-Definition Multimedia Interface (HDMI) terminal, or receive astreaming signal from a predetermined network router 500 via a network.

The image display apparatus 100 may process the received broadcastsignal, external input signal or streaming signal, display video on adisplay 180 and output audio.

In the embodiment of the invention, the image display apparatus 100wirelessly transmits audio data to an external device, for example, amobile terminal 600, in a wireless audio transmission mode. For audiotransmission, the image display apparatus 100 may perform direct orindirect communication with the mobile terminal.

In FIG. 1, data is exchanged between the image display apparatus 100 andthe mobile terminal 600 via the network router 500.

The image display apparatus 100 may include a TV, a monitor, a computer,a laptop, a tablet PC, etc., all of which are capable of displayingbroadcast content.

The network router 500 provides a network such that data is exchangedbetween the image display apparatus 100 and the mobile terminal 600.

For example, if the network router 500 is a wireless network router, aplurality of virtual IP addresses may be internally allocated to theimage display apparatus 100 and the mobile terminal 600, respectively,while utilizing the same external Internet Protocol (IP) address.Wireless channels may be allocated in correspondence with the virtual IPaddresses.

That is, the network router 500 may allocate a first wireless channel tothe image display apparatus 100 in correspondence with a first virtualIP address, allocate a second wireless channel to a first mobileterminal 600 a in correspondence with a second virtual IP address, andallocate a third wireless channel to a second mobile terminal 600 b incorrespondence with a third virtual IP address.

The network router 500 control data exchange between the image displayapparatus 100 and the mobile terminals 600 a and 600 b via the channelsrespectively allocated thereto.

If an electronic apparatus capable of performing wireless datacommunication is added to a wireless network provided by the networkrouter 500, the network router 500 may additionally allocate a virtualIP address and a wireless channel to the electronic apparatus, asdescribed above.

The network router 500 may provide environment information of thewireless channels respectively corresponding to the image displayapparatus 100 and the mobile terminals 600 a and 600 b. For example, thenetwork router may provide security information, channel nameinformation, signal intensity information etc., of the wirelesschannels.

The wireless network provided by the network router 500 may be a WiFibased wireless network.

The mobile terminal 600 may perform voice communication or datacommunication and examples thereof include a mobile phone, a smartphone, a laptop, a tablet PC, etc.

In the embodiment of the invention, the mobile terminal 600 maywirelessly receive audio data from an external device, for example, theimage display apparatus 100, in a wireless audio reception mode. Foraudio data reception, the mobile terminal 600 may perform direct orindirect communication with the image display apparatus 100.

In the embodiment of the invention, if the wireless audiotransmission/reception mode is performed, first, the image displayapparatus 100 and the mobile terminals 600 a and 600 b are synchronizedusing a first wireless communication method. That is, control data maybe transmitted from the mobile terminals 600 a and 600 b to the imagedisplay apparatus 100 and feedback data corresponding to the controldata may be transmitted from the image display apparatus 100 to themobile terminals 600 a and 600 b.

The control data may include at least one of wireless audio transmissionmode start or end information, wireless channel setting requestinformation, wireless channel change request information, allocatedwireless channel information, decoding information, wireless channelenvironment information or playback delay information. The feedback datamay include at least one of information about the number of channels ofaudio data to be transmitted, encoding state information, encodingscheme information, playback point-of-time information, or current timeinformation.

In order to secure data communication reliability, the first wirelesscommunication method is a two-way communication method and may be atransmission control protocol (TCP) based communication method.

For example, if a wireless audio reception mode start signal istransmitted as TCP packet data from the first mobile terminal 600 a tothe image display apparatus 100 via the wireless router (or the networkrouter) 500, the image display apparatus 100 may transmit informationabout the number of channels of the audio data to be transmitted ofmultimedia data played back (or reproduced) by the image displayapparatus, encoding state information, encoding scheme information,etc., to the first mobile terminal 600 a via the wireless router 500,for the wireless audio transmission mode.

Next, if synchronization between the image display apparatus 100 and themobile terminals 600 a and 600 b is completed, the image displayapparatus 100 may transmit audio data to the mobile terminals 600 a and600 b via the wireless router 500 using a second wireless communicationmethod different from the first wireless communication method.

For low-delay streaming of audio data and multi-user support, the secondwireless communication method may be a one-way and multicast basedcommunication method and may be a real time transmission protocol(RTP)/user datagram protocol (UDP) based communication method.

For example, if synchronization between the first and second mobileterminals 600 a and 600 b and the image display apparatus 100 iscompleted, the image display apparatus 100 may transmit an RTP/UDPpacket including an audio signal of a broadcast image which is currentlybeing played back by the image display apparatus 100 to the first andsecond mobile terminals 600 a and 600 b via the wireless router 500.

The transmitted audio signal may be adaptively changed depending onwhether the audio signal can be decoded in the mobile terminal, awireless channel environment, playback delay of the mobile terminal,etc. For example, various audio signals such as a demultiplexed audiosignal of a stereo channel, a demultiplexed audio signal of a monochannel, a decoded audio signal of a stereo channel, a decoded audiosignal of a mono channel, an encoded audio signal of a stereo channeland an encoded audio signal of a mono channel may be transmitted fromthe image display apparatus 100 to the mobile terminals 600 a and 600 b.

When the audio data is transmitted, playback point-of-time informationof the audio data, current time information, etc., may be transmitted tothe mobile terminals 600 a and 600 b. At this time, the playbackpoint-of-time information and the current time information may betransmitted to the mobile terminals 600 a and 600 b via the wirelessrouter 500 together with the audio data in the form of an RTP/UDP packetor may be transmitted to the mobile terminals 600 a and 600 b via thewireless router 500 as TCP packet data separately from the audio data.

Unlike FIG. 1, wireless data communication between the image displayapparatus 100 and the mobile terminals 600 a and 600 b is possiblewithout the network router 500. At this time, WiFi Direct based datacommunication may be performed between the image display apparatus 100and the mobile terminals 600 a and 600 b.

FIG. 2 is a diagram showing an instance in which a user listens to anaudio signal using the image display system of FIG. 1.

Referring to FIG. 2, if a wireless audio transmission/reception mode isinitiated in the image display system according to the embodiment of theinvention, video data 50 of multimedia data displayed on the imagedisplay apparatus 100 may be continuously played back and displayed andaudio data of the multimedia data may be transmitted to the mobileterminal 600. The mobile terminal 600 play back the audio data receivedfrom the image display apparatus 100.

Then, a user 800 may conveniently listen to audio data corresponding tothe video data of the multimedia data displayed on the image displayapparatus 100 using an earphone 700 through the mobile terminal 600.

In particular, in the wireless audio transmission mode, an audio outputunit 185 of the image display apparatus 100 is in a mute mode and thusmay not output an audio signal directly. Thus, other users who do notwish to listen to the audio data may not listen to the audio signal whenthe image display apparatus 100 plays back the multimedia data.

In FIG. 2, an object 60 representing the mute mode is displayed on thedisplay 180 of the image display apparatus 100.

FIG. 3 is a block diagram showing the internal configuration of theimage display apparatus of FIG. 1.

Referring to FIG. 3, the image display apparatus 100 according to theembodiment of the invention includes a broadcast reception unit 105, anexternal device interface 130, a memory 140, a user input interface 150,a sensor unit, a controller 170, a display 180, an audio output unit 185and a remote controller 200.

The broadcast reception unit 105 may include a tuner unit 110, ademodulator 120 and/or a network interface 135. As needed, the broadcastreception unit 105 may include only the tuner unit 110 and thedemodulator 120 or only the network interface 135.

The tuner unit 110 tunes to a Radio Frequency (RF) broadcast signalcorresponding to a channel selected by a user from among RF broadcastsignals received through an antenna or RF broadcast signalscorresponding to all channels previously stored in the image displayapparatus. The tuned RF broadcast is converted into an IntermediateFrequency (IF) signal or a baseband Audio/Video (AV) signal.

For example, the tuned RF broadcast signal is converted into a digitalIF signal DIF if it is a digital broadcast signal and is converted intoan analog baseband AV signal (Composite Video Banking Sync/SoundIntermediate Frequency (CVBS/SIF)) if it is an analog broadcast signal.That is, the tuner unit 110 may process a digital broadcast signal or ananalog broadcast signal. The analog baseband AV signal (CUBS/SIF) outputfrom the tuner unit 110 may be directly input to the controller 170.

The tuner unit 110 may be capable of receiving RF broadcast signals froman Advanced Television Systems Committee (ATSC) single-carrier system orfrom a Digital Video Broadcasting (DVB) multi-carrier system.

The tuner unit 110 may sequentially select a number of RF broadcastsignals corresponding to all broadcast channels previously stored in theimage display apparatus by a channel storage function from a pluralityof RF signals received through the antenna and may convert the selectedRF broadcast signals into IF signals or baseband A/V signals.

The tuner unit 110 may include a plurality of tuners in order to receivebroadcast signals of a plurality of channels. Alternatively, the tunerunit may include a single tuner for simultaneously receiving broadcastsignals of a plurality of channels.

The demodulator 120 receives the digital IF signal DIF from the tunerunit 110 and demodulates the digital IF signal DIF.

The demodulator 120 may perform demodulation and channel decoding,thereby obtaining a stream signal TS. The stream signal may be a signalin which a video signal, an audio signal and a data signal aremultiplexed.

The stream signal output from the demodulator 120 may be input to thecontroller 170 and thus subjected to demultiplexing and A/V signalprocessing. The processed video and audio signals are output to thedisplay 180 and the audio output unit 185, respectively.

The external device interface 130 may serve to transmit or receive datato or from an external device connected thereto. For interfacing, theexternal device interface 130 may include an A/V Input/Output (I/O) unitand/or a wireless communication module.

The external device interface 130 may be connected to an external devicesuch as a Digital Versatile Disc (DVD) player, a Blu-ray player, a gameconsole, a camera, a camcorder, or a computer (e.g., a laptop computer),wirelessly or by wire so as to perform an input/output operation withrespect to the external device.

The A/V I/O unit externally receives video and audio signals from theexternal device. The wireless communication unit may perform short-rangewireless communication with another electronic apparatus.

The network interface 135 serves as an interface between the imagedisplay apparatus 100 and a wired/wireless network such as the Internet.The network interface 135 may include a wired communication unit or awireless communication unit.

For example, the network interface 135 may receive content or dataprovided by an Internet or content provider or a network operator over anetwork.

The network interface 135 performs data communication with the networkrouter 500 and can perform data exchange within the network of thenetwork router 500.

In the embodiment of the embodiment of the invention, in the wirelessaudio transmission mode, for synchronization with the mobile terminal600, the network interface 135 may receive control data of a TCP packetformat from the mobile terminal 600 via the network router 500 andtransmit feedback data of a TCP packet format to the mobile terminal 600via the network router 500.

After synchronization is completed, the network interface 135 maytransmit audio data of an RTP/UDP packet format corresponding to themultimedia data played back (or reproduced) by the image displayapparatus to the mobile terminal 600 via the network router 500.

The memory 140 may store various programs necessary for the controller170 to process and control signals, and may also store processed video,audio and data signals.

The memory 140 may temporarily store a video, audio and/or data signalreceived from the external device interface 130. The memory 140 maystore information about a predetermined broadcast channel by the channelstorage function of a channel map.

While the memory 140 is shown in FIG. 3 as being configured separatelyfrom the controller 170, to which the invention is not limited, thememory 140 may be incorporated into the controller 170.

The user input interface 150 transmits a signal input by the user to thecontroller 170 or transmits a signal received from the controller 170 tothe user.

For example, the user input interface 150 may transmit/receive varioususer input signals such as a power-on/off signal, a channel selectionsignal, and a screen setting signal from a remote controller 200, mayprovide the controller 170 with user input signals received from localkeys, such as inputs of a power key, a channel key, and a volume key,and setting values, or provide the controller 170 with a user inputsignal received from a sensor unit for sensing a user gesture, ortransmit a signal received from the controller 170 to a sensor unit.

The controller 170 may demultiplex the stream signal received from thetuner unit 110, the demodulator 120, or the external device interface130 into a number of signals, process the demultiplexed signals intoaudio and video data, and output the audio and video data.

The video signal processed by the controller 170 may be displayed as animage on the display 180. The video signal processed by the controller170 may also be transmitted to an external output device through theexternal device interface 130.

The audio signal processed by the controller 170 may be output to theaudio output unit 185. Also, the audio signal processed by thecontroller 170 may be transmitted to the external output device throughthe external device interface 130.

The controller 170 may include a DEMUX, a video processor, etc., whichwill be described in detail later with reference to FIG. 4.

The controller 170 may control the overall operation of the imagedisplay apparatus 100. For example, the controller 170 controls thetuner unit 110 to tune to an RF signal corresponding to a channelselected by the user or a previously stored channel.

The controller 170 may control the image display apparatus 100 by a usercommand input through the user input interface 150 or an internalprogram.

The controller 170 may control the display 180 to display images. Theimage displayed on the display 180 may be a Two-Dimensional (2D) orThree-Dimensional (3D) still or moving image.

The controller 170 recognizes the position of the user based on an imagecaptured by a camera unit. For example, a distance (z-axis coordinate)between the user and the image display apparatus 100 may be detected. Anx-axis coordinate and a y-axis coordinate in the image display apparatus100 corresponding to the position of the user may be detected.

A channel browsing processor for generating a thumbnail imagecorresponding to a channel signal or an external input signal may befurther included. The channel browsing processor may receive the streamsignal TS output from the demodulator 120 or the stream signal outputfrom the external device interface 130, extract an image from thereceived stream signal, and generate a thumbnail image. The generatedthumbnail image may be decoded into a stream form to be input to thecontroller 170 together with the decoded image. The controller 170 maydisplay a thumbnail list including a plurality of thumbnail images onthe display 180 using the input thumbnail image.

The thumbnail list may be displayed in a brief viewing method ofdisplaying the thumbnail list in a part of an area in a state ofdisplaying a predetermined image or may be displayed in a full viewingmethod of displaying the thumbnail list in a full area. The thumbnailimages in the thumbnail list may be sequentially updated.

The display 180 converts the video signal, the data signal, the OSDsignal and the control signal processed by the controller 170 or thevideo signal, the data signal and the control signal received by theexternal device interface 130 and generates a drive signal.

The display 180 may be a Plasma Display Panel (PDP), a Liquid CrystalDisplay (LCD), an Organic Light-Emitting Diode (OLED) display or aflexible display. In particular, the display 180 may be a 3D display.

For viewing a 3D image, the display 180 may be divided into asupplementary display method and a single display method.

In the single display method, a 3D image is implemented on the display180 without a separate subsidiary device, for example, glasses. Thesingle display method may include, for example, a lenticular method, aparallax barrier, or the like.

In the supplementary display method, a 3D image is implemented on thedisplay 180 using a subsidiary device as a viewing device. Thesupplementary display method includes various methods such as aHead-Mounted Display (HMD) method or a glasses method.

The glasses method may be divided into a passive method such as apolarized glasses method and an active method such as a shutter glassesmethod. The HMD method may be divided into a passive method and anactive method.

The viewing device may be 3D glasses capable of enabling a user to viewa 3D image. The 3D glasses may include passive type polarized glasses,active type shutter glasses or HMD type glasses.

The viewing device may be glasses capable of enabling users to viewdifferent images. For example, a first viewing device may enable a userto view only a first image and a second viewing device may enable a userto view only a second image.

If the display 180 is a touchscreen, the display 180 may function as notonly an output device but also as an input device.

The audio output unit 185 receives the audio signal processed by thecontroller 170 and outputs the received audio signal as sound.

The camera unit captures images of a user. The camera unit may beimplemented by one camera, but the invention is not limited thereto.That is, the camera unit may be implemented by a plurality of cameras.The camera unit may be embedded in the image display apparatus 100 atthe upper side of the display 180 or may be separately provided. Imageinformation captured by the camera unit may be input to the controller170.

The controller 170 may sense a user gesture from an image captured bythe camera unit, a signal sensed by the sensor unit, or a combination ofthe captured image and the sensed signal.

The remote controller 200 transmits user input to the user inputinterface 150. For transmission of user input, the remote controller 200may use various communication techniques such as IR communication, RFcommunication, Bluetooth, Ultra Wideband (UWB) and ZigBee. In addition,the remote controller 200 may receive a video signal, an audio signal ora data signal from the user input interface 150 and output the receivedsignals visually or audibly.

The above-described image display apparatus 100 may be a fixed or mobiledigital broadcast receiver capable of receiving a digital broadcast.

The block diagram of the image display apparatus 100 illustrated in FIG.3 is only by example. Depending upon the specifications of the imagedisplay apparatus 100 in actual implementation, the components of theimage display apparatus 100 may be combined or omitted or new componentsmay be added. That is, two or more components may be incorporated intoone component or one component may be configured as separate components,as needed. In addition, the function of each block is described for thepurpose of describing the embodiment of the invention and thus specificoperations or devices should not be construed as limiting the scope andspirit of the invention.

Unlike FIG. 3, the image display apparatus 100 may not include the tunerunit 110 and the demodulator 120 shown in FIG. 3 and may receivebroadcast content via the network interface 135 or the external deviceinterface 135 and play back the broadcast content.

FIG. 4 is a block diagram showing the internal configuration of thecontroller illustrated in FIG. 3.

Referring to FIG. 4, the controller 170 according to the embodiment ofthe invention may include a DEMUX 310, an audio processor 315, a videoprocessor 320, a processor 330, an OSD generator 340 and a mixer 345.The controller 170 may further include a data processor.

The DEMUX 310 demultiplexes an input stream. For example, the DEMUX 310may demultiplex an MPEG-2 TS into a video signal, an audio signal, and adata signal. The stream signal input to the DEMUX 310 may be receivedfrom the tuner unit 110, the demodulator 120 or the external deviceinterface 135.

The audio processor 315 may process the demultiplexed audio signal. Foraudio processing, the audio processor 315 may include various decoders.For efficient transmission of the audio data to the mobile terminal 600,the audio processor 315 may further include an encoder.

In the wireless audio transmission mode of the image display apparatus100 according to the embodiment of the invention, the audio datatransmitted to the mobile terminal 600 may be 1) audio data which isdemultiplexed by the DEMUX 310 and is not decoded by the audio processor315, 2) audio data which is demultiplexed by the DEMUX 310, is decodedby the audio processor 315 and is encoded for transmission to the mobileterminal 600 or 3) audio data which is demultiplexed by the DEMUX 310and is decoded by the audio processor 315.

In the instance of the audio data of 1), although a time for acquiringthe audio data to be transmitted to the mobile terminal 600 is short,since the audio data is not decoded, the mobile terminal 600 whichreceives the audio data may not decode the audio data if the mobileterminal does not include the decoder.

In the instance of the audio data of 2), since the decoded audio data,that is, the uncompressed audio data, is encoded, it is possible toimprove transmission efficiency when wirelessly transmitting the audiodata to the mobile terminal 600 and to encode the audio data inconsideration of the decoder included in the mobile terminal. However,since the image display apparatus 100 performs demultiplexing, decodingand encoding, it is difficult to perform synchronization between theimage display apparatus and the mobile terminal.

In the instance of the audio of 3), since the demultiplexed audio datais decoded, the mobile terminal 600 may receive the uncompressed audiodata. Accordingly, the mobile terminal 600 may immediately play back theaudio data without performing a separate decoding step. Upon wirelesstransmission between the image display apparatus 100 and the mobileterminal 600, the amount of wireless data to be transmitted is increasedand thus a wide frequency bandwidth is necessary for a wireless channel.

In the embodiment of the invention, any one of the audio data of 1) to3) is adaptively transmitted according to a wireless channel environmentor playback delay information of the mobile terminal, which will bedescribed with reference to FIG. 20 and subsequent figures thereof.

The audio processor 315 may also adjust the bass, treble or volume ofthe audio signal.

The video processor 320 may process the demultiplexed video signal. Forvideo signal processing, the video processor 320 may include a videodecoder 325 and a scaler 335.

The video decoder 325 decodes the demultiplexed video signal and thescaler 335 scales the resolution of the decoded video signal so that thevideo signal can be displayed on the display 180.

The processor 330 may control the overall operation of the image displayapparatus 100 or the controller 170. For example, the processor 330controls the tuner unit 110 to tune to an RF signal corresponding to achannel selected by the user or a previously stored channel.

The processor 330 may control the image display apparatus 100 by a usercommand input through the user input interface 150 or an internalprogram.

The processor 330 may control data transmission of the network interface135 or the external device interface 130.

The processor 330 may control the operation of the DEMUX 310, the videoprocessor 320 and the OSD generator 340 of the controller 170.

The OSD generator 340 generates an OSD signal autonomously or accordingto user input. For example, the OSD generator 340 may generate signalsby which a variety of information is displayed as graphics or text onthe display 180, according to user input signals. The OSD signal mayinclude various data such as a User Interface (UI), a variety of menus,widgets, icons, etc. Also, the OSD signal may include a 2D object and/ora 3D object.

The OSD generator 340 may generate a pointer which can be displayed onthe display according to a pointing device received from the remotecontroller 200. In particular, such a pointer may be generated by apointing signal processor and the OSD generator 340 may include such apointing signal processor. Alternatively, the pointing signal processormay be provided separately from the OSD generator 340.

The mixer 345 may mix the decoded video signal processed by the videoprocessor 320 with the OSD signal generated by the OSD generator 340.

The data processor of the controller 170 may process the demultiplexeddata signal. For example, if the demultiplexed data signal was encoded,the data processor may decode the data signal. The encoded data signalmay be Electronic Program Guide (EPG) information including broadcastinginformation such as the start time and end time of broadcast programs ofeach channel.

The block diagram of the controller 170 shown in FIG. 4 is by example.The components of the block diagrams may be integrated or omitted, or anew component may be added according to the specifications of thecontroller 170.

FIG. 5 is a block diagram showing the internal configuration of thewireless router of FIG. 1.

Referring to FIG. 5, the network router 500 may include a networkinterface 530, a memory 540 and a processor 520.

The network interface 530 may exchange data with the image displayapparatus 100 or the mobile terminal 600.

More specifically, in a wireless audio transmission mode, forsynchronization with the mobile terminal 600, the network interface 530may receive TCP packet based control data from the mobile terminal 600,transmit the TCP packet based control data to the image displayapparatus 100, receive TCP packet based feedback data from the imagedisplay apparatus 100 and transmit the TCP packet based feedback data tothe mobile terminal 600.

Next, if synchronization is completed, the network interface 530 mayreceive RTP/UDP packet based audio data from the image display apparatus100 and transmit RTP/UDP packet based audio data to the mobile terminal600, for wireless audio data transmission to the mobile terminal 600.

The memory 540 may store an external IP address and internally allocatedvirtual IP addresses for providing a wireless network and wirelesschannel names, frequency ranges and security information correspondingto the virtual IP addresses. The memory 540 may store the name of theimage display apparatus 100 and the name of the mobile terminal 600connected to the network via the network router 500.

The processor 520 controls the overall operation of the network router500.

As described above, for wireless audio transmission/reception mode, theprocessor may control data exchange between the image display apparatus100 and the mobile terminal 600. If an electronic apparatus is added tothe network, the processor may additionally allocate a virtual IPaddress and a wireless channel to the electronic apparatus. Theprocessor may provide wireless channel environment information to theimage display apparatus 100 and the mobile terminal 600. For example,the processor may provide security information, channel nameinformation, signal intensity information, etc., of the wirelesschannel.

FIG. 6 is a block diagram showing the internal configuration of themobile terminal of FIG. 1.

Referring to FIG. 6, the mobile terminal 600 may include a wirelesscommunication unit 610, an audio/video (A/V) input unit 620, a userinput unit 630, a sensing unit 640, an output unit 650, a memory unit660, an interface unit 670, a controller 680 and a power supply 690.

The wireless communication unit 610 according to the embodiment of theinvention may transmit TCP packet based control data to the imagedisplay apparatus 100 via the wireless router 500 and receive TCP packetbased feedback data from the image display apparatus 100 via thewireless router 500, for synchronization with the image displayapparatus 100 in a wireless audio reception mode.

The wireless communication unit 610 may receive RTP/UDP packet basedaudio data from the image display apparatus 100 via the wireless router500, for a wireless audio reception mode if synchronization iscompleted.

The wireless communication unit 610 may include a broadcast receptionmodule 611, a mobile communication module 613, a wireless Internetmodule 615, an NFC module 617, and a global positioning system (GPS)module 619.

The broadcast reception module 611 receives at least one of a broadcastsignal and broadcast-related information from an external broadcastmanagement server through a broadcast channel. The broadcast channel mayinclude a satellite channel and a terrestrial channel.

The broadcast signal and/or the broadcast-related information receivedthrough the broadcast reception module 611 may be stored in the memory660.

The mobile communication module 613 transmits or receives a wirelesssignal to or from at least one of a base station, an external terminaland a server over a mobile communication network. The wireless signalmay include a voice call signal, a video call signal or various types ofdata associated with transmission and reception of a text/multimediamessage.

The wireless Internet module 615 is an internal or external module forwireless Internet access which may be provided to the mobile terminal600. For example, the wireless Internet module 615 may perform WiFibased wireless communication or WiFi Direct based wirelesscommunication.

The NFC module 617 may perform NFC. The NFC module 617 may receive ortransmit data from or to an electronic apparatus including an NFC tag oran NFC module mounted therein if the electronic apparatus approaches themobile terminal 600 within a predetermined distance, that is, if theelectronic device is tagged.

As short-range wireless communication technology, Bluetooth,Radio-Frequency IDentification (RFID), Infrared Data Association (IrDA),Ultra WideBand (UWB), and ZigBee may be used.

The GPS module 619 may receive position information from a plurality ofGPS satellites.

The A/V input unit 610 receives an audio signal or a video signal andmay include a camera 621 and a microphone 623.

The user input unit 630 generates key input data enabling the user tocontrol the operation of the terminal. The user input unit 630 mayinclude a keypad, a dome switch, a touchpad (static pressure/staticelectrical), etc. In particular, if the touchpad and the display 651have a layered structure, it may be called a touchscreen.

The sensing unit 640 detects a current state of the mobile terminal 600such as whether the mobile terminal 600 is opened or closed, theposition of the mobile terminal 600 and contact/non-contact thereof by auser and generates a sensing signal for controlling the operation of themobile terminal 600.

The sensing unit 640 may include a proximity sensor 641, a pressuresensor 643 and a motion sensor 645. The motion sensor 645 may sensemotion or position of the mobile terminal 600 using an accelerationsensor, a gyroscopic sensor and a gravity sensor. In particular, thegyroscopic sensor measures an angular speed and senses a direction(angle) in which the mobile terminal rotates from a reference direction.

The output unit 650 may include a display 651, an audio output module653, an alarm unit 655 and a haptic module 657.

The display 651 displays information processed by the mobile terminal600.

As described above, if the display 651 and the touchpad have the layeredstructure to configure the touchscreen, the display 651 can be used notonly as an output device but also as an input device for inputtinginformation via user touch.

The audio output module 653 may output audio data received from thewireless communication module 610 or stored in the memory 660. The audiooutput module 653 may include a speaker, a buzzer, etc.

The alarm unit 655 outputs a signal notifying the user that an event hasoccurred in the mobile terminal 600.

The haptic module 657 generates a variety of tactile effects that theuser can feel. A typical example of the tactile effect generated by thehaptic module 657 is vibration.

The memory 660 may store a program for processing and control of thecontroller 680 and may temporarily store input or output data (forexample, a phonebook, messages, audio, still images, and moving images).

The interface 670 serves as an interface with all external devicesconnected to the mobile terminal 600. The interface 670 may receive datafrom an external device or receive power and transmit power to thecomponents of the mobile terminal 600 or transmit data of the mobileterminal 600 to an external device.

The controller 680 controls the overall operation of the mobile terminal600. For example, the controller 680 performs control and processingassociated with voice communication, data communication, videocommunication, and the like. The controller 680 may include a multimediaplayback module 681 for multimedia playback. The multimedia playbackmodule 681 may be implemented in the controller 680 in hardware form ormay be implemented in software form separately from the controller 680.The operation of the controller 680 for multimedia playback will bedescribed below with reference to FIG. 11 and subsequent figuresthereof.

The power supply 690 receives external power or internal power andsupplies power required for operation to each component under control ofthe controller 680.

The block diagram of the mobile terminal 600 shown in FIG. 6 is only byexample. Depending upon the specifications of the mobile terminal 600 inactual implementation, the components of the mobile terminal 600 may becombined or omitted or new components may be added. That is, two or morecomponents may be incorporated into one component or one component maybe configured as separate components, as needed. In addition, thefunction of each block is described for the purpose of describing theembodiment of the invention and thus specific operations or devicesshould not be construed as limiting the scope and spirit of theinvention.

FIG. 7 is a flowchart illustrating a method for operating an imagedisplay apparatus according to an embodiment of the invention.

Referring to FIG. 7, first, the image display apparatus 100 enters awireless audio transmission mode when receiving a wireless audioreception mode entrance signal from the mobile terminal (S725). Then,synchronization with the mobile terminal 600 is performed using a firstwireless communication method (S730).

The network interface 135 of the image display apparatus 100 may receivea TCP packet including a wireless audio transmission mode start signalvia the wireless router 500. In the embodiment of the invention, inorder to secure data communication reliability, a TCP basedcommunication method may be employed as the first wireless communicationmethod.

The controller 170 of the image display apparatus 100 may controlentrance into the wireless audio transmission mode if the wireless audiotransmission mode start signal in the TCP packet is received. Then, thecontroller 170 may control the image display apparatus to performsynchronization with the mobile terminal 600.

More specifically, the controller 170 of the image display apparatus 100may control transmission of information about the number of channels ofaudio data to be transmitted, encoding state information, encodingscheme information, etc., as feedback data in the form of the TCP packetin correspondence with the received wireless audio transmission modestart signal.

The information about the number of channels indicates informationindicating whether the channel of audio data to be transmitted is a monochannel, a stereo channel or a 5.1 channel.

The encoding state information may indicate whether audio data to betransmitted is 1) audio data which is demultiplexed by the DEMUX 310 andis not decoded by the audio processor 315, 2) audio data which isdemultiplexed by the DEMUX 310, is decoded by the audio processor 315and is encoded for transmission to the mobile terminal 600 or 3) audiodata which is demultiplexed by the DEMUX 310 and is decoded by the audioprocessor 315.

The encoding scheme information is valid when the encoding stateinformation indicates encoded audio data and may indicate whether anencoding scheme is an AC3 encoding scheme or an AAC encoding scheme.

For example, if the image display apparatus 100 receives the wirelessaudio transmission mode start signal in a state of playing back abroadcast image of a specific channel as multimedia data, the controller170 of the image display apparatus 100 controls transmission of AAC asencoding scheme information if the encoding scheme of audio data to betransmitted is an AAC encoding scheme and controls transmission of astereo channel as information about the number of channels if the numberof channels is 2.

Next, the network interface 135 of the image display apparatus 100 mayreceive a TCP packet including synchronization completion informationindicating that synchronization with the mobile terminal 600 iscompleted. Then, synchronization between the image display apparatus 100and the mobile terminal 600 is completed. That is, preparation for audiodata transmission is completed in the wireless audio transmission mode.

Next, the image display apparatus 100 extracts an audio signal frommultimedia data (S740). The extracted audio signal is transmitted to themobile terminal using a second communication method (S750).

After synchronization is completed, the controller 170 of the imagedisplay apparatus 100 extracts an audio signal to be transmitted. Forexample, if the multimedia data is a broadcast signal, the controller170 and, more particularly, the DEMUX 310 of the image display apparatusmay demultiplex a broadcast stream into an audio signal, a video signaland a data signal.

In the wireless audio transmission mode according to the embodiment ofthe invention, the audio data transmitted to the mobile terminal 600 maybe 1) audio data which is demultiplexed by the DEMUX 310 and is notdecoded by the audio processor 315, 2) audio data which is demultiplexedby the DEMUX 310, is decoded by the audio processor 315 and is encodedfor transmission to the mobile terminal 600 or 3) audio data which isdemultiplexed by the DEMUX 310 and is decoded by the audio processor315.

The controller 170 of the image display apparatus 100 may controlselection of any one of the audio signal of 1) to 3) and transmission ofthe selected audio signal to the mobile terminal 600 in the form of aone-way multicast RTP/UDP packet.

In the embodiment of the invention, for low-delay streaming of audiodata and multi-user support, a real time transmission protocol(RTP)/user datagram protocol (UDP) based communication method may beemployed as the second wireless communication method.

Next, the image display apparatus 100 plays back the multimedia data(S760). In particular, the controller 170 of the image display apparatus100 may decode the video signal among the demultiplexed audio signal,video signal and data signals and output the video signal to bedisplayed on the display 180. Then, the display 180 may display thebroadcast image corresponding to the received broadcast signal. At thistime, the audio output unit 185 of the image display apparatus 100 maynot output a broadcast audio signal corresponding to the receivedbroadcast signal. That is, the audio output unit 185 of the imagedisplay apparatus is in a mute mode and thus may not output an audiosignal. Thus, other users who do not wish to listen to the audio dataneed not listen to the audio signal when the image display apparatus 100plays back the multimedia data.

FIG. 8 is a flowchart illustrating a method for operating a mobileterminal according to an embodiment of the invention.

Referring to FIG. 8, first, the mobile terminal 600 enters a remotecontrol mode for the image display apparatus (S805) and displays aremote control screen (S810). In a state of displaying the remotecontrol screen, it is determined whether a wireless audio reception modestart signal is received (S815) and, if so, the mobile terminal entersthe wireless audio reception mode (S816). Then, a wireless audioreception screen is displayed (S818) and synchronization with the imagedisplay apparatus is performed using the first wireless communicationmethod (S820).

If a remote control menu item or a remote control application item ofthe mobile terminal 600 is executed, the controller 680 of the mobileterminal 600 may control entrance of the image display apparatus 100into the remote control mode. The controller 680 of the mobile terminal600 may control display of the remote control screen 1310 shown in (a)of FIG. 13 on the display 651.

The remote control screen 1310 of (b) of FIG. 13 includes a mute item, achannel control item, a volume control item, a wireless audio receptionmode item (WiFi sound) 1315. If a user selects the wireless audioreception mode item (WiFi sound) 1315, the controller 680 of the mobileterminal 600 may determine that the wireless audio reception mode isselected and control display of the wireless audio reception screenindicating the wireless audio reception mode.

(b) of FIG. 13 shows the wireless audio reception screen. A WiFi soundscreen 1330 indicating the wireless audio reception mode is displayed onthe display 651.

The WiFi sound screen 1330 of (b) of FIG. 13 includes an object (denotedby WiFi sound) 1332 indicating the wireless audio reception mode, achannel control item 1334 and a volume control item 1336.

If the wireless audio reception mode item (WiFi sound) 1315 of theremote control screen 1310 is selected, the controller 680 of the mobileterminal 600 may control transmission of a TCP packet including awireless audio reception mode start signal to the image displayapparatus 100, separately from control of display of the WiFi soundscreen 1330, as shown in (b) of FIG. 13. That is, the controller 680 maycontrol synchronization with the image display apparatus 100.

The image display apparatus 100 enters the wireless audio reception modeand performs synchronization with the mobile terminal. That is, theimage display apparatus 100 may transmit information about the number ofchannels of audio data to be transmitted, encoding state information,encoding scheme information, etc., as feedback data in the form of a TCPpacket. The controller 680 of the mobile terminal 600 may receiveinformation about the number of channels, encoding state information,encoding scheme information, etc., via the wireless communication unit610.

The controller 680 of the mobile terminal 600 may control transmissionof a TCP packet including synchronization completion informationindicating that synchronization with the image display apparatus 100 iscompleted, if synchronization with the image display apparatus 100 iscompleted.

Next, the mobile terminal 600 receives an audio signal from the imagedisplay apparatus using the second wireless communication method (S850).After synchronization is completed, the image display apparatus 100 maytransmit audio data in the form of an RTP/UDP packet and the controller680 of the mobile terminal 600 receives audio data. The audio data maybe 1) non-encoded audio data, 2) encoded audio data or 3) multiplexedand encoded audio data.

Next, the mobile terminal 600 plays back the received audio data (S865).In particular, the controller 680 of the mobile terminal 600 plays backaudio data and outputs the played audio data via the audio output module653, in correspondence with any one of the audio data of 1) to 3).

The user of the mobile terminal 600 may listen to the audio signaloutput from the mobile terminal 600 while viewing the video of themultimedia data played back (or reproduced) by the image displayapparatus 100.

Unlike FIG. 8, even when the remote control screen is not displayed onthe mobile terminal 600, the mobile terminal may immediately enter thewireless audio reception mode. For example, the mobile terminal mayimmediately enter the wireless audio reception mode if a hot keyindicating a wireless audio reception mode is manipulated or a wirelessaudio reception mode app is executed. By manipulation of the hot key orthe execution of the app, without displaying the remote control screen,the WiFi sound screen 1330 shown in (b) of FIG. 13 may be immediatelydisplayed on the mobile terminal 600.

FIG. 9 is a flowchart illustrating an operation of an image displaysystem according to an embodiment of the invention.

The operation of the image display system of FIG. 9 corresponds to FIGS.7 and 8.

More specifically, operations S905 to S918 (S905, S910, S915, S916 andS918) correspond to operations S805 to S818 (S805, S810, S815, S816 andS818) of FIG. 8 and operations S922 to S928 (S922, S924, S926 and S928)correspond to operation S830 of FIG. 8 and operation S730 of FIG. 7.

Operation S940 corresponds to operation S740 of FIG. 7 and operationsS942 to S944 (S942 and S944) correspond to operation S750 of FIG. 7 andoperation S850 of FIG. 8.

Operation S960 corresponds to operation S760 of FIG. 7 and operationS965 corresponds to operation S865 of FIG. 8.

FIG. 10 is a view referred to for describing TCP packet data exchangebetween the image display apparatus and the mobile terminal.

The controller 680 of the mobile terminal 600 may control transmissionof control data via a TCP transmitter 1125. Control data may include atleast one of wireless audio reception mode start information or endinformation, wireless channel setting request information, allocatedwireless channel information, decoding information, wireless channelenvironment information or playback delay information.

Among such control data, during a synchronization process, wirelessaudio reception mode start information, wireless channel setting requestinformation, allocated wireless channel information, decodinginformation, etc., may be transmitted to the image display apparatus100.

Among such control data, during an audio data reception process,wireless audio reception mode end information, wireless channel changerequest information, wireless channel environment information, playbackdelay information, etc., may be transmitted to the image displayapparatus 100.

The controller 170 of the image display apparatus 100 may receivecontrol data via a TCP receiver 1025. The controller 170 may controltransmission of feedback data via the TCP transmitter 1020. Feedbackdata may include at least one of information about the number ofchannels of audio data to be transmitted, encoding state information,encoding scheme information, playback point-of-time information, currenttime information, etc.

Among such control data, during a synchronization process, informationabout the number of channels of audio data to be transmitted, encodingstate information, encoding scheme information, etc., may be transmittedto the mobile terminal 600.

Among such control data, during an audio data transmission process,playback point-of-time information, etc., of audio data to betransmitted may be transmitted to the mobile terminal 600.

In FIG. 10, a synchronizer 1010 of the image display apparatus 100 isprovided separately from the controller 170 such that current timeinformation is transmitted to the mobile terminal 600 via a TCPtransmitter 1020 separately from feedback data. A synchronizer 1110 ofthe mobile terminal 600 is provided separately from the controller 680such that current time information is received via a TCP receiver 1120together with feedback data.

The current time information may be transmitted in a state of beingincluded in feedback data.

The TCP receiver 1025 and the TCP transmitter 1020 of the image displayapparatus 100 may be included in the network interface 135 of FIG. 3.The TCP receiver 1120 and the TCP transmitter 1125 of the mobileterminal 600 may be included in the wireless communication unit 610 ofFIG. 6.

FIG. 11 is a view referred to for describing RTP/UDP packet dataexchange between the image display apparatus and the mobile terminal andFIG. 12 schematically shows the structure of RTP/UDP packet data.

The image display apparatus 100 may receive multimedia data from thetuner unit 110, the external device interface 130 or the networkinterface 135.

In the case of stream data, the DEMUX 310 demultiplexes stream data, adecoder 1030 decodes audio data, and an encoder 1040 encodes the decodedaudio data. The DEMUX 310, the decoder 1030 and the encoder 1040 may beincluded in the controller 170.

Audio data transmittable to the mobile terminal 600 may be {circlearound (1)} audio data which is demultiplexed by the DEMUX 310 and isnot decoded by the decoder 1030, {circle around (2)} audio data which isdemultiplexed by the DEMUX 310, is decoded by the decoder 1030 and isencoded by the encoder 1040 or {circle around (3)} audio data which isdemultiplexed by the DEMUX 310 and is decoded by the decoder 1030.

As shown in FIG. 12, audio data 1210 to be transmitted may be attachedwith an RTP packet 1220 by an RTP transmitter 1045 of the image displayapparatus 100, may be attached with a UDP packet 1230 by a UDPtransmitter 1050, and may be transmitted to the mobile terminal 600 asan IP packet 1240.

A UDP receiver 1150 of the mobile terminal 600 separates the UDP packet1230, the RTP receiver 1145 separates the RTP packet 1220 and suppliesthe audio data 1210 to an encoder 1130 or an audio output module 653(more accurately, an audio playback buffer).

If audio data transmitted by the image display apparatus 100 is audiodata of {circle around (1)} or {circle around (2)}, since the audio datawas encoded, the audio data is decoded by the decoder 1130 and isprovided to the audio output module 653.

As another example, if audio data transmitted by the image displayapparatus 100 is audio data of {circle around (3)}, since the audio datawas decoded, the audio data is provided to the audio output module 653without being decoded.

The RTP transmitter 1045 and the UDP transmitter 1050 of the imagedisplay apparatus 100 may be included in the network interface 135 ofFIG. 3. The UDP receiver 1150 and the RTP receiver 1145 of the mobileterminal 600 may be included in the wireless communication unit 610 ofFIG. 6.

FIG. 14 shows another example of a user interface of the mobile terminalfor entering a wireless audio reception mode, similarly to FIG. 13.

Referring to FIG. 14, and unlike FIG. 13, if a “TV sharing” item 1305 ofthe remote control screen 1310 of (a) of FIG. 14 is selected, as shownin (b) of FIG. 14, a TV sharing screen may be displayed. In FIG. 14, theTV sharing screen includes remote control items such as a WiFi sounditem 1322, a second TV item 1324, a cloud TV item 1326, etc.

Among others, if the WiFi sound item 1322 is selected, the controller680 of the mobile terminal 600 may control display of a WiFi soundscreen 1330 as shown (c) of FIG. 14, which shows a wireless audioreception screen similar to that of (b) of FIG. 13. In addition, thecontroller 680 of the mobile terminal 600 may control transmission of aTCP packet including a wireless audio reception mode start signal to theimage display apparatus 100 separately from the WiFi sound screen 1330.That is, the controller 680 may control synchronization with the imagedisplay apparatus 100.

FIG. 15 is a flowchart illustrating a method for operating an imagedisplay apparatus according to another embodiment of the invention.

Referring to FIG. 15, the controller 170 of the image display apparatus100 receives a wireless audio reception mode entrance signal from themobile terminal 600 (S1510). As described in operation 5710 of FIG. 7,the image display apparatus 100 may receive TCP packet data including awireless audio transmission mode start signal. The TCP receiver 1025 mayseparate a TCP packet and send the wireless audio transmission modestart signal to the controller 170 of the image display apparatus 100.

Next, the controller 170 of the image display apparatus 100 transmitsinformation about audio data to be transmitted to the mobile terminal600 (S1520). For example, the TCP receiver 1020 may transmit a TCPpacket including information about the number of channels of audio datato be transmitted, encoding state information, encoding schemeinformation, etc., to the mobile terminal 600.

Next, the controller 170 of the image display apparatus 100 receivesdecoding information from the mobile terminal 600 (S1530). Audio data ofan encoding state corresponding to the decoding information istransmitted (S1540).

The controller 680 of the mobile terminal 600 may generate decodinginformation indicating whether audio data to be received by the mobileterminal 600 can be decoded using the encoding scheme information of thereceived information about the audio data. The decoding information is aflag in which a value of “1” may indicate that audio data can be decodedand a value of “0” may indicate that audio data cannot be decoded.

The controller 170 of the image display apparatus 100 receives thedecoding information through the TCP receiver 1020. If audio data can bedecoded, the controller 170 maintains the encoding scheme of audio datato be transmitted and transmits the audio data to the mobile terminal600.

The controller 170 of the image display apparatus 100 changes theencoding method of audio data to be transmitted and transmits the audiodata to the mobile terminal 600, if the decoding information indicatesthat the audio data cannot be decoded.

For example, if the encoding scheme of audio data to be transmitted isan AAC encoding scheme and the mobile terminal 600 cannot performdecoding using such an encoding scheme, the image display apparatus 100receives information indicating that decoding cannot be performed. Theimage display apparatus 100 may change the encoding scheme of audio datato be transmitted to an AC3 encoding scheme and transmit the audio datato the mobile terminal 600 again. If the mobile terminal 600 can decodethe audio data using the AC3 encoding scheme, information indicatingthat decoding can be performed may be transmitted to the image displayapparatus 100. Thus, the image display apparatus 100 may controltransmission of the audio data of the AC3 encoding scheme to the mobileterminal 600.

The encoding scheme may be changed by changing a source of audio data tobe transmitted. That is, the encoding scheme may be changed by changingaudio data to be transmitted from the audio data of {circle around (1)}of FIG. 11 to the audio data of {circle around (3)} of FIG. 11.

For example, if the encoding scheme of the audio data of {circle around(1)} is an AAC encoding scheme and the encoding scheme of the encoder1040 is an AC3 encoding scheme, audio data to be transmitted may bechanged from the audio data of {circle around (1)} to the audio data of{circle around (3)} of FIG. 11.

Next, the image display apparatus plays back multimedia data (S1550). Inparticular, the controller 170 of the image display apparatus 100 maydecode a video signal among the demultiplexed audio signal, video signaland data signal and output the video signal to be displayed on thedisplay 180. Thus, the display 180 may display a broadcast imagecorresponding to the received broadcast signal. At this time, the audiooutput unit 185 of the image display apparatus 100 may not output abroadcast audio signal corresponding to the received broadcast signal.

FIG. 16 is a flowchart illustrating a method for operating a mobileterminal according to another embodiment of the invention, and FIGS. 17to 19 are views referred to for describing various examples of themethod for operating the image display apparatus of FIG. 15 or themethod for operating the mobile terminal of FIG. 16.

Referring to FIG. 16, the mobile terminal 600 transmits a wireless audioreception mode entrance signal to the image display apparatus 100(S1610) and receives information about audio data from the image displayapparatus 100 (S1620). Operation S1610 corresponds to operation S1710 ofFIG. 17 and operation S1620 corresponds to operation S1720 of FIG. 17.

The TCP transmitter 1125 of the mobile terminal 600 may transmit TCPpacket data including a wireless audio reception mode start signal tothe image display apparatus 100. (a) of FIG. 19 shows transmission of awireless audio reception mode start signal SWi_s from the mobileterminal 600 to the image display apparatus 100.

The TCP receiver 1025 of the image display apparatus 100 may receive theTCP packet data including the wireless audio reception mode startsignal, separate a TCP packet and send the wireless audio reception modestart signal to a playback manager 1070. The playback manager 1070 ofthe image display apparatus 100 regards the wireless audio receptionmode start signal as the wireless audio transmission mode start signalfrom the viewpoint of the image display apparatus 100.

The playback manager 1070 of the image display apparatus 100 may controltransmission of information about audio data to be transmitted to themobile terminal 600. Thus, the TCP transmitter 1020 of the image displayapparatus 100 may transmit the TCP packet including information aboutthe number of channels of audio data to be transmitted, encoding stateinformation, encoding scheme information, etc., to the mobile terminal600.

(b) of FIG. 19 shows transmission of information Inf_and about audiodata to be transmitted from the image display apparatus 100 to themobile terminal 600.

The TCP receiver 1120 of the mobile terminal 600 may receive TCP packetdata including the information about the audio data, separate a TCPpacket and send information about the number of channels of audio datato be transmitted, encoding state information, encoding schemeinformation, etc., to the playback manager 1170.

Next, the mobile terminal 600 transmits decoding information to theimage display apparatus 100 (S1630) and receives audio datacorresponding to decoding information from the image display apparatus100 (S1640). The received audio data is played back (S1650). OperationS1630 corresponds to operation S1730 of FIG. 17, operation S1640corresponds to operation S1740 of FIG. 17, and operation S1650corresponds to operation S1750 of FIG. 17.

The playback manager 1170 of the mobile terminal 600 may determinewhether the decoder 1130 of the mobile terminal 600 can decode audiodata to be received based on the received encoding scheme information,etc. The playback manager 1170 of the mobile terminal 600 may controltransmission of decoding information indicating whether audio data canbe decoded through the TCP transmitter 1125.

(c) of FIG. 19 shows transmission of decoding information Inf_able fromthe mobile terminal 600 to the image display apparatus 100.

The TCP receiver 1025 of the image display apparatus 100 may receive TCPpacket data including decoding information, separate a TCP packet andsend the decoding information to the playback manager 1070.

The playback manager 1070 of the image display apparatus 100 may controltransmission of audio data corresponding to the received decodinginformation.

For example, the source of audio data to be transmitted may be changedin correspondence with the received decoding information. That is, theaudio data to be transmitted may be changed from the audio data of{circle around (1)} of FIG. 11 to the audio data of {circle around (3)}of FIG. 11.

For example, if the mobile terminal 600 can perform decoding using anAC3 encoding scheme, the encoding scheme of the audio data of {circlearound (1)} is an AAC encoding scheme and the encoding scheme of theencoder 1040 is an AC3 encoding scheme, the playback manager 1070 of theimage display apparatus 100 may control a converter 1085 to change theaudio data to be transmitted from the audio data of {circle around (1)}into the audio data of {circle around (3)} of FIG. 11.

The RTP transmitter 1045 and the UDP transmitter 1050 of the imagedisplay apparatus 100 may transmit data, to which an RTP packet isattached, and data, to which a UDP packet is attached, to the mobileterminal 600, respectively.

The playback manager 1070 of the image display apparatus 100 may controla synchronizer 1080 such that playback point-of-time information ofaudio data to be transmitted and current time information aretransmitted to the mobile terminal 600. The playback point-of-timeinformation and the current time information are output from thesynchronizer 1080. Then, the TCP transmitter 1020 of the image displayapparatus 100 may transmit a TCP packet including playback point-of-timeinformation and current time information to the mobile terminal 600.

(d) of FIG. 19 shows transmission of audio data Audio_1, 2 or 3,playback point-of-time information Inf-pt, etc., from the image displayapparatus 100 to the mobile terminal 600.

The UDP receiver 1150 and the RTP receiver 1145 of the mobile terminal600 may respectively separate a UDP packet and an RTP packet such thataudio data is sent to a buffer 1190.

The playback manager 1170 of the mobile terminal 600 controls playbackof the received audio data.

If the audio data transmitted by the image display apparatus 100 is theaudio data of {circle around (1)} or {circle around (2)}, since theaudio data was encoded, the audio data is decoded by the decoder 1130and is provided to the audio output module 653.

As another example, if the audio data transmitted by the image displayapparatus 100 is {circle around (3)}, since the audio data was decoded,the audio data is immediately provided to the audio output module 653without being decoded.

The DEMUX 310, the decoder 1030, the encoder 1040 and the playbackmanager 1070 of FIG. 18 may be included in the controller 170 of theimage display apparatus 100. Among others, the playback manager 1070 maycorrespond to the processor 330 of FIG. 4. The TCP transmitter 1020, theTCP receiver 1025, the UDP transmitter 1050 and the RTP transmitter 1045of FIG. 18 may be included in the network interface 135 of FIG. 3. Thebuffer 1090 may correspond to the memory 140.

The playback manager 1170 of the mobile terminal 600 of FIG. 18 may beincluded in the controller 680 of the mobile terminal 600. The TCPtransmitter 1125, the TCP receiver 1125, the UDP transmitter 1150 andthe RTP transmitter 1145 of FIG. 18 may be included in the wirelesscommunication unit 610 of FIG. 3. The buffer 1190 may correspond to thememory 660.

Although the audio signal processed by the RTP receiver 1145 is shown asbeing output to the decoder 1130 or the audio output module 653 via thebuffer 1130 in FIG. 18, if the audio signal processed by the RTPreceiver 1145 is an encoded audio signal, the audio signal may bedecoded by the decoder 1130 and the decoded audio signal may be storedin the buffer 1190. That is, the buffer 1190 may be interposed betweenthe audio output module 653 and the decoder 1130.

FIG. 20 is a flowchart illustrating a method for operating an imagedisplay apparatus according to another embodiment of the invention, FIG.21 is a flowchart illustrating a method for operating a mobile terminalaccording to another embodiment of the invention, and FIGS. 22A to 23Dare views referred to for describing various examples of the method foroperating the image display apparatus of FIG. 20 or the method foroperating the mobile terminal of FIG. 21.

Referring to FIG. 20, the image display apparatus 100 transmits audiodata to the mobile terminal 600 (S2005). The mobile terminal 600receives the audio data (S2105).

The RTP transmitter 1045 and the UDP transmitter 1050 of the imagedisplay apparatus 100 may transmit an RTP/UDP packet including audiodata to the mobile terminal 600. The UDP receiver 1150 and the RTPreceiver 1145 of the mobile terminal 600 may respectively separate a UDPpacket and an RTP packet such that audio data is sent to the buffer1190.

FIG. 22A shows transmission of first audio data Audio_a (stereo channeland encoded audio data) from the image display apparatus 100 to themobile terminal 600.

The image display apparatus 100 may transmit playback point-of-timeinformation of audio data and current time information to the mobileterminal 600 in addition to the audio data to be transmitted. Suchplayback point-of-time information and current time information may beoutput from the synchronizer 1080. Then, the TCP transmitter 1020 of theimage display apparatus 100 may transmit a TCP packet including playbackpoint-of-time information, current time information, etc., to the mobileterminal 600.

The TCP receiver 1120 of the mobile terminal 600 may receive TCP packetdata including playback point-of-time information and current timeinformation, etc., separate a TCP packet, and send playbackpoint-of-time information and current time information, etc., to theplayback manager 1170.

Next, the playback manager 1170 of the mobile terminal 600 calculatesplayback delay information (S2107). The playback manager 1170 of themobile terminal 600 may calculate playback delay information of audiodata based on audio data received from the image display apparatus,playback point-of-time information and current time and current timeinformation from the synchronizer 1180.

Next, the image display apparatus 100 plays back multimedia data(S2010). Then, the mobile terminal 600 plays back the received audiodata (S2110).

The playback manager 1070 of the image display apparatus 100 controlsplayback of multimedia data, for example, may control provision of thevideo data decoded by the decoder 1030 to the buffer 1090, controlbuffering of buffer 1090, and control video playback timing of themultimedia data. The buffer 1090 outputs the received video data to thedisplay 180 according to a set buffering value. In FIG. 22A, thebuffering value of the buffer 1090 of the image display apparatus 100 is2 ms.

The playback manager 1170 of the mobile terminal 600 controls playbackof audio data. In FIG. 22A, since the first audio data Audio_a wasreceived, the playback manager 1170 provides the encoded audio datawhich is temporarily stored in the buffer 1190 to the decoder 1130 andcontrols the decoder 1130 to decode the encoded audio data. The decodedaudio data is provided to the audio output module 653 to be played back.

The playback manager 1170 of the mobile terminal 600 determines whetherthe playback delay information calculated in operation S2107 is equal toor greater than a predetermined value (S2113) and, if so, controlstransmission of the playback delay information to the image displayapparatus 100 (S2120). Then, the image display apparatus 100 receivesthe playback delay information (S2020).

The calculated playback delay information may be transmitted to theimage display apparatus 100 via the TCP transmitter 1125. The TCPreceiver 1025 of the image display apparatus 100 may transmit playbackdelay information to the playback manager 1070.

Next, the image display apparatus 100 changes the number of channels ofthe audio data to be transmitted if the playback delay information isreceived from the mobile terminal 600 (S2025). The audio data, thenumber of channels of which is changed, is transmitted to the mobileterminal 600 (S2030). Thus, the mobile terminal 600 receives the audiodata, the number of channels of which is changed.

FIG. 22B shows transmission of second audio data Audio_b (mono channeland encoded audio data) from the image display apparatus 100 to themobile terminal 600 if the image display apparatus 100 receives playbackdelay information Inf_d1 from the mobile terminal 600. That is, audiodata, the number of channels of which is changed from 2 to 1, istransmitted.

The number of channels may be changed by the converter 1085 of the imagedisplay apparatus 100.

The buffer 1190 of the mobile terminal 600 temporarily stores the audiodata, the number of channels of which is changed.

Next, the playback manager 1170 of the mobile terminal 600 calculatesplayback delay information with respect to the audio data, the number ofchannels of which is changed (S2127). The playback manager 1170 of themobile terminal 600 may calculate the playback delay information of theaudio data based on audio data received from the image displayapparatus, playback point-of-time information and current timeinformation and the current time information from the synchronizer 1180.

The playback manager 1170 of the mobile terminal 600 controls playbackof the audio data, the number of channels of which is changed. Since thechannel is changed from a stereo channel to a mono channel, an audioplayback time may be reduced. Thus, the audio data may be played back insynchronization with the multimedia data played back by the imagedisplay apparatus 100.

The playback manager 1170 of the mobile terminal 600 determines whetherthe playback delay information calculated in operation S2127 is equal toor greater than a predetermined value (S2133) and, if so, controlstransmission of the playback delay information to the image displayapparatus 100 (S2135). Then, the image display apparatus 100 receivesthe playback delay information (S2035).

Next, if the image display apparatus 100 additionally receives theplayback delay information, for example, operation S2030 and subsequentoperations thereof will be performed.

That is, the image display apparatus 100 delays the playback time of themultimedia data (S2040). It is determined whether playback delayinformation is additionally received (S2045), and, if playback delayinformation is additionally received, audio data, the encoding state ofwhich is changed, is transmitted to the mobile terminal 600 (S2050). Theimage display apparatus 100 plays back multimedia data (S2070).

FIG. 22C shows delay of the playback time of the image display apparatus100 when the image display apparatus 100 additionally receives playbackdelay information Inf_d2 from the mobile terminal 600.

That is, in FIG. 22C, the buffering value of the buffer 1090 of theimage display apparatus 100 is changed from 2 ms to 10 ms. As thebuffering value is increased, the output time of the video data outputfrom the buffer 1090 to the display 180 is delayed and thus the playbacktime of the multimedia data is delayed. The increase amount of thebuffering value may be determined according to playback delayinformation Inf_d2.

Since the playback time of the multimedia data is delayed, second audiodata Audio_b (mono channel and encoded audio data) may be continuouslytransmitted from the image display apparatus 100 to the mobile terminal600 without change.

FIG. 22D shows transmission of third audio data Audio_c (mono channeland decoded audio data) from the image display apparatus 100 to themobile terminal 600 if the image display apparatus 100 additionallyreceives playback delay information Inf_d3 from the mobile terminal 600.That is, the encoding state of the audio data is changed from theencoded audio data to the decoded audio data.

The encoding state may be changed by the converter 1085 of the imagedisplay apparatus 100. That is, the converter 1085 may output the audiodata of {circle around (1)} demultilexed by the DEMUX 310 or the audiodata of {circle around (2)} encoded by the encoder 1040 and then outputthe audio data of {circle around (3)} decoded by the decoder 1030.

The buffer 1190 of the mobile terminal 600 temporarily stores thereceived audio data and the playback manager 1170 of the mobile terminal600 provides the audio data to the audio output module 653 without useof the decoder 1130 such that the audio data is audibly output.

Next, if the playback delay information is additionally received inoperation S2035, operation S2055 and subsequent operations thereof maybe performed.

That is, the image display apparatus 100 transmits audio data, theencoding state of which is changed. Then, the mobile terminal 600receives the audio data, the encoding state of which is changed (S2155).The image display apparatus 100 delays the playback time of themultimedia data (S2065) if the playback delay information isadditionally received (S2060). The image display apparatus 100 playsback multimedia data (S2070). Then mobile terminal 600 receives theaudio data, the encoding state of which is changed (S2155) and playsback audio data (S2170).

Operations 2055 to S2065 (S2055, S2060 and S2065) correspond tooperations 2040 to S2050 (S2040, S2045 and S2050) except that theencoding state is changed and the playback time of the multimedia dataof the image display apparatus is delayed after the number of audiochannel is changed.

Operations S2040 to S2050 (S2040, S2045 and S2050) and operations S2055to S2065 (S2055, S2060 and S2065) may be alternately performed. That is,if operations S2040 to S2050 (S2040, S2045 and S2050) are performed,operations S2055 to S2065 (S2055, S2060 and S2065) may not be performed.Alternatively, if operations S2055 to S2065 (S2055, S2060 and S2065) isperformed, operations S2040 to S2050 (S2040, S2045 and S2050) may not beperformed.

FIG. 23A shows transmission of first audio data Audio_1 (stereo channeland encoded audio data) from the image display apparatus 100 to themobile terminal 600, similarly to FIG. 22A.

FIG. 23B shows transmission of second audio data Audio_2 (mono channeland encoded audio data) from the image display apparatus 100 to themobile terminal 600 if the image display apparatus 100 receives playbackdelay information Inf_d1 from the mobile terminal 600. That is, audiodata, the number of channels of which is changed from 2 to 1, istransmitted.

FIG. 23C shows transmission of third audio data Audio_3 (mono channeland decoded audio data) from the image display apparatus 100 to themobile terminal 600 if the image display apparatus 100 additionallyreceives playback delay information Inf_d2 from the mobile terminal 600.That is, the audio data is changed from the encoded audio data to thedecoded audio data.

FIG. 23D shows delay of the playback time of the image display apparatus100 when the image display apparatus 100 additionally receives playbackdelay information Inf_d3 from the mobile terminal 600.

That is, in FIG. 23D, the buffering value of the buffer 1090 of theimage display apparatus 100 is changed from 2 ms to 10 ms. As thebuffering value is increased, the output time of the video data outputfrom the buffer 1090 to the display 180 is delayed and thus the playbacktime of the multimedia data is delayed. The increase amount of thebuffering value may be determined according to playback delayinformation Inf_d3.

Although data exchange is shown as being directly performed between theimage display apparatus 100 and the mobile terminal 600 in FIG. 10 andsubsequent figures thereof, the invention is not limited thereto. Thatis, as described with reference to FIG. 1, data exchange may beperformed between the image display apparatus 100 and the mobileterminal 600 via the network router 500.

According to an embodiment of the invention, an image display apparatusperforms synchronization with a mobile terminal using a first wirelesscommunication method according to wireless audio transmission mode andtransmits extracted audio data to the mobile terminal using a secondwireless communication method different from the first wirelesscommunication method. By performing synchronization and audio datatransmission using different wireless communication methods, it ispossible to efficiently perform wireless audio data transmission.Accordingly, it is possible to improve user convenience.

In particular, if a transmission control protocol (TCP) basedcommunication method is used as the first wireless communication method,it is possible to secure data communication reliability of control dataand feedback data.

If a real time transmission protocol (RTP)/user datagram protocol (UDP)based communication method is used as the second wireless communicationmethod, it is possible to enable low-delay streaming of audio data andmulti-user support.

According to another embodiment of the invention, an image displayapparatus transmits audio data of an encoding level corresponding todecoding information received from a mobile terminal. Thus, audio datacorresponding to multimedia data played back by the image displayapparatus can be played back by the mobile terminal. Accordingly, it ispossible to improve user convenience.

If wireless channel environment information or playback delayinformation of the mobile terminal is received while the image displayapparatus plays back multimedia data or the mobile terminal plays backaudio data, the image display apparatus performs an operation forchanging the number of channels of the audio data to be transmitted, anoperation for delaying a playback time of the multimedia data or anoperation for changing an encoding state of the audio data to betransmitted based on such information. Thus, multimedia data playbackcan be synchronized with audio data playback of the mobile terminal.Accordingly, a user can listen to the audio data synchronized with themultimedia data using the mobile terminal.

By executing the wireless audio transmission mode with respect to themobile terminal, only a user who wishes to listen to audio data canlisten to the audio data and a user which does not wish to listen to theaudio data cannot listen to the audio data. Accordingly, it is possibleto provide a service according to user preference and improve userconvenience.

The image display apparatus and the method for operating the sameaccording to the foregoing embodiments are not restricted to theembodiments set forth herein. Therefore, variations and combinations ofthe example embodiments set forth herein may fall within the scope ofthe invention.

The method for operating an image display apparatus according to theforegoing embodiments may be implemented as code that can be written toa computer-readable recording medium and can thus be read by aprocessor. The computer-readable recording medium may be any type ofrecording device in which data can be stored in a computer-readablemanner. Examples of the computer-readable recording medium include aROM, a RAM, a CD-ROM, a magnetic tape, a floppy disc, and an opticaldata storage. The computer-readable recording medium can be distributedover a plurality of computer systems connected to a network so thatcomputer-readable code is written thereto and executed therefrom in adecentralized manner. Functional programs, code, and code segmentsneeded for realizing the embodiments herein can be construed by one ofordinary skill in the art.

Although the embodiments of the invention have been disclosed forillustrative purposes, those skilled in the art will appreciate thatvarious modifications, additions and substitutions are possible, withoutdeparting from the scope and spirit of the invention as disclosed in theaccompanying claims.

What is claimed is:
 1. A method for operating an image displayapparatus, the method comprising: receiving a wireless audiotransmission mode entrance signal from a mobile terminal; transmittinginformation about audio data to be transmitted to the mobile terminal;receiving decoding information from the mobile terminal; transmittingaudio data of an encoding state corresponding to the decodinginformation; and playing back multimedia data associated with the audiodata, wherein, if wireless channel environment information between themobile terminal and the image display apparatus or playback delayinformation of the mobile terminal is received during multimedia dataplayback, performing signal processing such that the multimedia dataplayback is synchronized with audio data playback of the mobile terminalbased on the wireless channel environment information or the playbackdelay information.
 2. The method according to claim 1, wherein theinformation about the audio data includes at least one of informationabout the number of channels, encoding state information, encodingscheme information, playback point-of-time information and current timeinformation of the audio data to be transmitted.
 3. The method accordingto claim 1, wherein the transmitting of the audio data includes:transmitting audio data demultiplexed from the multimedia data and notdecoded if the decoding information indicates that the audio data can bedecoded; and transmitting the audio data demultiplexed from themultimedia data and decoded if the decoding information indicates thatthe audio data cannot be decoded.
 4. The method according to claim 1,wherein: the reception of the wireless audio transmission mode entrancesignal, the transmission of the information about the audio data and thereception of the decoding information are performed based on a firstwireless communication method, and the transmission of the audio data isperformed based on a second wireless communication method different fromthe first wireless communication method.
 5. The method according toclaim 1, wherein the performing signal processing such that themultimedia data playback is synchronized with audio data playback of themobile terminal comprises at least one of: based on the wireless channelenvironment information or the playback delay information, changing thenumber of channels of the transmitted audio data; delaying a playbacktime of the multimedia data; and changing an encoding state of the audiodata to be transmitted.
 6. A method for operating a mobile terminal, themethod comprising: transmitting a wireless audio transmission modeentrance signal to an image display apparatus; receiving informationabout audio data to be transmitted from the image display apparatus;transmitting decoding information indicating whether audio data to bereceived can be decoded to the image display apparatus based oninformation about the audio data; receiving audio data of an encodingstate corresponding to the decoding information from the image displayapparatus; and playing back the received audio data, wherein, ifwireless channel environment information between the mobile terminal andthe image display apparatus or playback delay information of the mobileterminal is received to the image display apparatus during multimediadata playback, the image display apparatus performs signal processingsuch that the multimedia data playback is synchronized with audio dataplayback of the mobile terminal based on the wireless channelenvironment information or the playback delay information.
 7. The methodaccording to claim 6, wherein the receiving the audio data of theencoding state corresponding to the decoding information includes:receiving audio data demultiplexed from the multimedia data and notdecoded if the decoding information indicates that the audio data can bedecoded; and receiving audio data demultiplexed from the multimedia dataand decoded if the decoding information indicates that the audio datacannot be decoded.
 8. An image display apparatus comprising: a display;a network interface to exchange data with a mobile terminal; and acontroller to transmit information about audio data to be transmitted tothe mobile terminal if a wireless audio transmission mode entrancesignal is received from the mobile terminal, to transmit audio data ofan encoding state corresponding to decoding information if the decodinginformation is received from the mobile terminal, and to play backmultimedia data associated with the audio data, wherein, if wirelesschannel environment information between the mobile terminal and theimage display apparatus or playback delay information of the mobileterminal is received during multimedia data playback, the controllerperforms signal processing such that the multimedia data playback issynchronized with audio data playback of the mobile terminal based onthe wireless channel environment information or the playback delayinformation.
 9. The image display apparatus according to claim 8,wherein the controller performs at least one of an operation forchanging the number of channels of the audio data to be transmitted, anoperation for delaying a playback time of the multimedia data and anoperation for changing an encoding state of the audio data to betransmitted.
 10. A mobile terminal comprising: an audio output module tooutput an audio signal to be played back; a wireless communication unitto exchange data with an image display apparatus; and a controller totransmit a wireless audio transmission mode entrance signal to the imagedisplay apparatus, to transmit decoding information indicating whetheraudio data to be received can be decoded to the image display apparatusbased on information about audio data if the information about the audiodata is received from the image display apparatus, and to play back thereceived audio data if audio data of an encoding state corresponding tothe decoding information is received from the image display apparatus,wherein, if wireless channel environment information between the mobileterminal and the image display apparatus or playback delay informationof the mobile terminal is received to the image display apparatus duringmultimedia data playback, the controller controls the image displayapparatus to perform signal processing such that the multimedia dataplayback is synchronized with audio data playback of the mobile terminalbased on the wireless channel environment information or the playbackdelay information.
 11. The mobile terminal according to claim 10,wherein the controller calculates playback delay information of theaudio data, transmits wireless channel environment information betweenthe mobile terminal and the image display apparatus or the playbackdelay information to the image display apparatus, and plays back theaudio data if the audio data corresponding to the wireless channelenvironment information or the playback delay information is received.